摘要
西安市作为汾渭平原典型城市,大气污染问题一直广为关注.本研究基于2014—2022年西安市的气象数据和环境空气质量监测数据,利用数理统计的方法对西安市大气污染特征及气象因子进行分析,再结合后向轨迹对典型污染事件进行深入分析.结果表明:西安市2014—2022年除O_(3)浓度增长外,其余5项污染物浓度均呈下降趋势;O_(3)月均浓度呈现“夏高冬低”的分布特征,颗粒物PM_(10)和PM_(2.5)重污染月为1月份;6项污染物的日内浓度变化明显,其中,O_(3)日内浓度分布特征为“单峰型”,PM_(10)与CO为“双峰双谷”的分布特征.从空间变化看,PM_(2.5)污染高值区逐年减少,O_(3)污染高值区从西部转移到中部;平均气温、相对湿度和降水等气象因子均与污染物浓度具有强相关性.通过后向轨迹聚类和潜在源区分析可知,PM_(2.5)重污染高值区域主要集中在河南西部、湖北西北部及陕西南部,主要为近距离传输;O_(3)重污染高值区域主要集中在湖南北部、湖北南部、四川东北部及陕西南部.
As a typical city in the Fenwei Plain,Xi'an has always been widely concerned about air pollution issues.This study is based on meteorological data and environmental air quality monitoring data of Xi'an City from 2014 to 2022.Mathematical statistical methods are used to analyze the characteristics and meteorological factors of air pollution in Xi'an City.The results showed that the concentration of five pollutants had a decreasing trend during 2014—2022,while the increase change for O_(3).The average monthly concentration of O_(3)is"high in summer and low in winter",and January is the most polluted month of PM_(10)and PM_(2.5).The diurnal concentration distribution of O_(3)is"single-peak",while the distribution characteristics of PM_(10)and CO are"double-peak and double-valley".From the perspective of spatial changes,the high value areas of PM_(2.5)pollution have been decreasing year by year,since the high value areas of O_(3)pollution have shifted from the west to the central region.Meteorological factors(average temperature,relative humidity and precipitation)are strongly correlated with pollutant concentrations.Through backward trajectory clustering and potential source area analysis,it can be concluded that the heavy polluted areas of PM_(2.5)are concentrated in western Henan,northwestern Hubei and southern Shaanxi.The heavy pollutede areas of O_(3)are concentrated in northern Hunan,southern Hubei,northeastern Sichuan,and southern Shaanxi.
作者
裴波妮
王郁聪
许瑞广
赵一飞
王璞
王虹宇
赵英帆
王丽涛
汪庆
刘景云
魏哲
PEI Boni;WANG Yucong;XU Ruiguang;ZHAO Yifei;WANG Pu;WANG Hongyu;ZHAO Yingfan;WANG Litao;WANG Qing;LIU Jingyun;WEI Zhe(School of Energy and Environmental Engineering,Hebei University of Engineering,Handan 056038;Hebei Key Laboratory of Air Pollution Cause and Impact,Handan 056038)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第9期80-92,共13页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目(No.42077393,72091510)
河北工程大学教育教学改革研究与实践项目(No.jg2022028)
邯郸市生态环境局项目(No.hk2022000169)
中央引导地方科技发展资金项目(No.236Z3705G)。
